날짜및 시간 선택 jquery 라이브러리

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<link rel="stylesheet" type="text/css" media="screen" href="https://cdnjs.cloudflare.com/ajax/libs/jquery-datetimepicker/2.5.20/jquery.datetimepicker.min.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-datetimepicker/2.5.20/jquery.datetimepicker.full.min.js"></script>
<script type="text/javascript">
$(function() { $(".datetimepicker").datetimepicker({ format: "Y-m-d H:i", }); }); </script>
<h1>datetimepicker</h1>
시작일시 : <input type='text' class='datetimepicker' name='start_dt'  style='width:140px;'>,
종료일시 : <input type='text' class='datetimepicker' name='end_dt'   style='width:140px; padding-left:10px;'>